Cut the beef into large chunks. Place in a pot and cover with cold water. Add the onion, garlic, bay leaf, salt, and pepper. Simmer over low heat for 2 hours, or until the beef is very tender.
Meanwhile, prepare the tamarind sauce: in a small saucepan, combine the tamarind paste, apple cider vinegar, brown sugar, and finely chopped jalapeño.
Heat the tamarind mixture over low heat until the sugar dissolves and the sauce slightly thickens, about 5-7 minutes.
Once the beef is tender, remove it from the pot and shred it with two forks.
Warm the tortillas in a dry skillet until pliable.
Fill the tortillas with the shredded beef, then spoon over the tamarind sauce.
Garnish with fresh cilantro, squeeze lime juice over the top, and serve immediately!
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